SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0404fde47dc49a845ff8983a5d9fc06e386318228f7b5ea496705db6e7ed3e5b' 
  AND token = '171qwERiVteehFQmkMHuwQpJAFVZESqnzkCAgsNL54k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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