SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c9afbd843e8f87231bb4642cbb69d28ed3b8195ec21c56f30e476e832c0614d' 
  AND token = 'ZrcJ6rT2RlbAKr7/QMYpJy+5WCVvwL8z+dLyQIJh6q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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