SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ca7982e3a796e8d843cf8bf03846ac53cde74948e070339ef55d91c810fb3182' 
  AND token = 'onTYLA/MLLgPVRK3dPkEexh9wmhvWxzHIu62qMlZeFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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