SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '433afb7f0caae1ec65c9685a6d6b36d4987a28430ddfec2860e0553e886b3782' 
  AND token = 'gHRDC9hjvH2BX5RUVn3SJ7HfFT17qHB57lMLHeKdzeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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