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For future reference, if you already have your app on Play Store you can this:

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Go to Release Management

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select App Signing in Release Management

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You can see SHA1 key in hex format App signing certificate.

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Copy the SHA1 in hex format and convert it in to base64 format, you can use this link http://tomeko.net/online_tools/hex_to_base64.php to do that without the SHA1:  part of the hex.

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Go to Facebook developer console and add the key(after convert to base 64) in the settings —> basic –> key hashes.

keytool -exportcert -alias <RELEASE_KEY_ALIAS> -keystore <RELEASE_KEY_PATH> | PATH_TO_OPENSSL_LIBRARY\bin\openssl sha1 -binary | PATH_TO_OPENSSL_LIBRARY\bin\openssl base64