SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '47acb44dff933deed284cd7f31ad093b7bca6f28f646a080f1d95aa86a14f71c' 
  AND token = 'gHxSmtztqBGV5YMCcPARPhuy8wlXunTX4W03fiNbqp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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