SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc1285075857b292b4ca2b13fb3be60432b4cf9619f6b190101f3f5286328f2b' 
  AND token = 'N5Jglf2WO/htjnRpWykNqj+FLhKAXFJhzvbCjZkuR24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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