SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5774093ad9dea49c58bdd2302865a4033b579aad3199c806511f1b3eefcf395b' 
  AND token = 'vt3A29nog/a4o2HC5wlAquFZWerKV9kqAYzYkxnd4Ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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