Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '516f4e0852cf34a6cc3d74b6c52a00570c8eb9383e8b8025efd1aa65f427ef21' 
  AND token = 'iieMI5WYqQ79e/ch5QTLSMBM7S7LaHJIaWKDjoWsftw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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