Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b983e7e1496a6e5fd453dc0dbed7cca831688ef76f38a08d29b442a5cdf1fa6' 
  AND token = '6zhlPc49tOuGzXfr65lcVS+/f399VhU+gURjc9SFRzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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