SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2275ba707365b889c39669f72cf326a5e111789026f3b6a3c0ae85adc9b0cd84' 
  AND token = 'T3NcAzDFJNiwZ+a/qlBunYqOBLY2DdUKbya1GVkt4Jo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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