SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6188fcda769933c37e5a9ad406cbde7f8efb207d0985c4d46a38c536d5208f9f' 
  AND token = 'fqv8E2B4r5MXMthxP2vSE/1xwizwVWQ9rk+q5W0ZdXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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