SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d0dc2844ae10d28d1b0810ed3b9b39cb1349778c6555835c0b7e592575613f0' 
  AND token = 'eJowGWMD4uD93HPD5KWhg/wgOIbPSCzkpyvSB+OkfHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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