SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca737705e361944b5442cedef13ff56d379545a487517ae459bf0df091197b69' 
  AND token = 'jQkwWa8WXXvK+mfdYpLySYvprEJKrhrRLqJbtb7k1qY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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