SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '347647a11ac4b3cfd75522b2cd88c24e656eab7a7d8b824e905f3bbb2dad8761' 
  AND token = 'PMPVjIWg13IJwvjwN3mr4I6qjQ5pjo6KNqF6CUS1f8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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