SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c118719072d4a3da6f2fd286110a644ebc69d55f77c13ed8a335000cc547dcd' 
  AND token = 'UsswDggvq82HVumPnIzx4J8S+EYZuKDH8GuNfDhkLEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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