SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92b89447781dd0ecf0b9222c4f68203d6d873439728a7ba7f8d6886805dac359' 
  AND token = 'A/5uuj+QSBZTq0sCtnP8c0VK6UqVKRHNh5QfByjueg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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