SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6453ff84c5b5fbec83fc13d6fe0c367d201aac9e5c133cd6279966b91b405d43' 
  AND token = 'EwDRWkI6ju0HxOVGKiXpVdNu1hEhjmKpY313ZxSCX+0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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