SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2fb195a58ef430953d994b61b46b78cf65fe5bcd58956a8eddc5ecda0314434e' 
  AND token = 'C1cZhQkYqJsAvce8KmC54K2JjAy2QGnxhVuLdoO7ufU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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