SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '640a609897b18ced3d4ae2c0ee8a613f34283d8b1098b7142729db1829709afc' 
  AND token = 'RLgD7kXsaSW4v2Yrm2+59q4amoFpoo/oh6bgjRwsB+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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