SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '699cb9ca97a0d6d9996ca96cef566293f144b8127cb51eb0f38cc9328a06c528' 
  AND token = 'EmSYnfPuuFvGqZeKEKqh1fyxkVpPejnAqTCHbpqt7UQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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