SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8db65a31ad8d24d0f020c3dcc445433056f32fa697a90c595e92e401c4f30314' 
  AND token = 'vKrST9SwI6zINdxBZuXjZ7Rjq/DvHSz6WwYExTQ6Z9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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