SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4bd1e568c19823eb758839c073f99e8de824ac55b84209a823cfb57efd352b47' 
  AND token = 'EObKpigfx+vpxy1Vsr1TB832n2GKEmUGW6vgXs+UXdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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