SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '32d8b4d6150442afa6a64e8d1e705a1138d80f87f94670d0e193b5745f8e836f' 
  AND token = '4mLAduDmoXjnX/hzZgDJ0KXuejAvmOtPGbIev9t+KFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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