SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '328f9000417e3bd9d4772a45e207c8bb855360c4e3a341b5a1720c84d051064f' 
  AND token = 'ADt6CIuqUw26gmzwW5aNzvb5Yt1U3CKOYBBBTxjpSpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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