SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ed624014864f55c9d512d05ce2f1b2a19ee1c5fd85de6c983a37789a51bd4b9' 
  AND token = '4hoglUnuzBD5BvvBzVNw4CvX4Vmetnix+lNahXJW/Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00303

JSON explain

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