SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '998ca9a4fa191b413a5ce4b26b3ea4e42536ebffac8abfc6dae80ab332dbb74d' 
  AND token = 'Xv71x8AeLYteGRmwVg1rYwuj+UC/k3rJF9QBKp7u5RU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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