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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d8f96e4aa4b4d75187e03cede2dfe51ba314098778ac39f776773e9db30f58f' 
  AND token = 'MuSdlrPIHR84x6qEub/YHUMkQc3BQ0ki9fqn2M0r8LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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