Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8f88a2351e14311649bac51834a0604d036f7b5b912f6d48f254943276557dd' 
  AND token = '5U+hgB1RhjNM8A7fgpwE6L2Dh6WwD5BKc2IBOdNk9kg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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