SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '40884b1c3a08231b8111173348ef4f24ab5a9954609fda3776749cd5d9b45079' 
  AND token = 'Nwvy6wpnwRTZhYmtRQ9PKnjR38rfAgHDhOBL9aOTFT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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