SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14afc8e3443f4f1b2eeda5acbb878f73fe9940d61667132c495ef08c900a4fd0' 
  AND token = 'mbRJbp5z14UyZavKeb2DJ4Qr9q1H+N5hj3yYCaw2HYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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