Following on from my post about the new key being added to the zone, the required 30 days have passed and if your resolver is RFC5011 compliant, it should now trust the key.

You can check this as follows:

BIND

$ cat /var/named/managed-keys.bind
$ORIGIN .
$TTL 0  ; 0 seconds
@                       IN SOA  . . (
                                1904       ; serial
                                0          ; refresh (0 seconds)
                                0          ; retry (0 seconds)
                                0          ; expire (0 seconds)
                                0          ; minimum (0 seconds)
                                )
                        KEYDATA 20170425142612 20170210095625 19700101000000 257 3 8 (
                                AwEAAagAIKlVZrpC6Ia7gEzahOR+9W29euxhJhVVLOyQ
                                bSEW0O8gcCjFFVQUTf6v58fLjwBd0YI0EzrAcQqBGCzh
                                /RStIoO8g0NfnfL2MTJRkxoXbfDaUeVPQuYEhg37NZWA
                                JQ9VnMVDxP/VHL496M/QZxkjf5/Efucp2gaDX6RS6CXp
                                oY68LsvPVjR0ZSwzz1apAzvN9dlzEheX7ICJBBtuA6G3
                                LQpzW5hOA2hzCTMjJPJ8LbqF6dsV6DoBQzgul0sGIcGO
                                Yl7OyQdXfZ57relSQageu+ipAdTTJ25AsRTAoub8ONGc
                                LmqrAmRLKBP1dfwhYB4N7knNnulqQxA+Uk1ihz0=
                                ) ; KSK; alg = RSASHA256; key id = 19036
                                ; next refresh: Tue, 25 Apr 2017 14:26:12 GMT
                                ; trusted since: Fri, 10 Feb 2017 09:56:25 GMT
2017-03-12.automated-ksk-test.research.icann.org KEYDATA 20170424152612 20170317172529 19700101000000 257 3 8 (
                                AwEAAa9qsSLDI+H0keqE3Yzdr6XuhqhBQVWw5xdgNoWL
                                hE4VxSEIBz9IuCA4w4ssSrClZ59seNc76ltDFcKJv3X9
                                jDjzRtBLjenIgV4n/3GpKrAAnRlYbUtpBEdlk4mxoL3B
                                lX8pfLg7RQfTlWaxOUga1+CChcVieFF/si/eePc9HpZb
                                WxHZRLCAE8dlDa0aa0tfVAZWOnaifpmbTvhDK3tdvMU0
                                tfG2YfsOYcFB9z2KWmCDYwCONNKtls3p6wMwolun1h8I
                                Yo0PF98vqjAp3NVRZvKKdgyF/bZ/iJtAZFytXvXU6Gwa
                                5tOm1wgP6wuKupscP8KHBluZyOSKw4RMTk6YBdE=
                                ) ; KSK; alg = RSASHA256; key id = 3934
                                ; next refresh: Mon, 24 Apr 2017 15:26:12 GMT
                                ; trusted since: Fri, 17 Mar 2017 17:25:29 GMT
                        KEYDATA 20170424152612 20170418002534 19700101000000 257 3 8 (
                                AwEAAfUtjasCuLysD4MbjG3v4Kyu0vvVJ/0cIreP6flt
                                MeZmwQ5SRta/mB+eFVjau+6YKra2UeTKxojBovHH2lZr
                                w7NNejL44/Xps4gR3LSVMnCdwras+yvj4en64ghRGWYO
                                uB+Icb0AqrCUhLFWR8yx41UkfaA2vzFnM2xTx0N0+o6R
                                6UciWuwJResomQupOjNUy2ZAi81Y3pb0x3Lw4POjpcSJ
                                zrK4aZ/5UPymplqhLEU2DsoQmyFlM5RNTt0YXR8XM4Yw
                                su/scxg0u00IF1GC8xcyZUTMc1Rz98AY1VUo5QqUp9Vb
                                Aed5Aw1nNYfjLTj+zOykedgmjms1iNgh9EY111c=
                                ) ; KSK; alg = RSASHA256; key id = 19741
                                ; next refresh: Mon, 24 Apr 2017 15:26:12 GMT
                                ; trusted since: Tue, 18 Apr 2017 00:25:34 GMT

We can see in the output above that the new key, keytag 19741, is now trusted.

Unbound

$ cat /var/lib/unbound/2017-03-12.automated-ksk-test.research.icann.org.ds
; autotrust trust anchor file
;;id: 2017-03-12.automated-ksk-test.research.icann.org. 1
;;last_queried: 1493044058 ;;Mon Apr 24 14:27:38 2017
;;last_success: 1493044058 ;;Mon Apr 24 14:27:38 2017
;;next_probe_time: 1493047519 ;;Mon Apr 24 15:25:19 2017
;;query_failed: 0
;;query_interval: 3600
;;retry_time: 3600
2017-03-12.automated-ksk-test.research.icann.org.       60      IN      DNSKEY  257 3 8 AwEAAa9qsSLDI+H0keqE3Yzdr6XuhqhBQVWw5xdgNoWLhE4VxSEIBz9IuCA4w4ssSrClZ59seNc76ltDFcKJv3X9jDjzRtBLjenIgV4n/3GpKrAAnRlYbUtpBEdlk4mxoL3BlX8pfLg7RQfTlWaxOUga1+CChcVieFF/si/eePc9HpZbWxHZRLCAE8dlDa0aa0tfVAZWOnaifpmbTvhDK3tdvMU0tfG2YfsOYcFB9z2KWmCDYwCONNKtls3p6wMwolun1h8IYo0PF98vqjAp3NVRZvKKdgyF/bZ/iJtAZFytXvXU6Gwa5tOm1wgP6wuKupscP8KHBluZyOSKw4RMTk6YBdE= ;{id = 3934 (ksk), size = 2048b} ;;state=2 [  VALID  ] ;;count=0 ;;lastchange=1489997718 ;;Mon Mar 20 08:15:18 2017
2017-03-12.automated-ksk-test.research.icann.org.       60      IN      DNSKEY  257 3 8 AwEAAfUtjasCuLysD4MbjG3v4Kyu0vvVJ/0cIreP6fltMeZmwQ5SRta/mB+eFVjau+6YKra2UeTKxojBovHH2lZrw7NNejL44/Xps4gR3LSVMnCdwras+yvj4en64ghRGWYOuB+Icb0AqrCUhLFWR8yx41UkfaA2vzFnM2xTx0N0+o6R6UciWuwJResomQupOjNUy2ZAi81Y3pb0x3Lw4POjpcSJzrK4aZ/5UPymplqhLEU2DsoQmyFlM5RNTt0YXR8XM4Ywsu/scxg0u00IF1GC8xcyZUTMc1Rz98AY1VUo5QqUp9VbAed5Aw1nNYfjLTj+zOykedgmjms1iNgh9EY111c= ;{id = 19741 (ksk), size = 2048b} ;;state=2 [  VALID  ] ;;count=0 ;;lastchange=1492590342 ;;Wed Apr 19 08:25:42 2017

Similarly, for unbound, we can see above that the status is now VALID.