The key you obtained and entered in the api console is for debugging purposes. You have to obtain sha1 key for the apk file from the Keystore file which you are using to digitally sign the apk
Procedure for obtaining SHA1 key for release mode
1) Go to the location where you have your 'keystore' file which you are using for digitally signing your application.
2) Open command window in that location. This can be done by 'shift+rightClick' and selecting the option 'Open Command Window here'
3) Use the following Command
keytool –v –list –keystore <name> -alias <aliasname>
where name- your keystore filename , aliasname - the alias name for the app
4) Then enter your keystore password
5) you will then get your sha1 keys along with other information. Use the key in the api console.