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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e03b2a0e983b766c57683de1f57e959212855c670fe2d5288bd19a9b2412f990' 
  AND token = 'r4ulfelZ6qkR2wyyoVtuXtQlsh5mSA+EqEHUIZvkTko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}