SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f7eb9d8bf422ef626df5a32490713c36e924e3249af9b579f579d917a990c282' 
  AND token = 'R0tQ+LLIOKjA8XSIxlTVQ1ZOJSWLYo9R2LUp+6wB71o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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