Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd197d408a998af23cea262aa3678ebe1a357d1a35bcc3ee01a6dee6e97c36e14' 
  AND token = 'mLWgKkOOjHr1jD6pmk+hp1rBhDtm9n3CYlAf5rIURjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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