SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6662bfbab21ec1496969aef4e4e3b43f61580ec9a93f23634d7d7f459e0ff0f4' 
  AND token = 'qMogKZoKB5KzFi8Rg5jWuq4pDLsFqTPWZ6ZcBlM8IIU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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