SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '53dca0309536909e8fba24e4983f978a3a72740d483a62a4740cc683dc281540' 
  AND token = 'BdHYSBVdUXV7WjweZ0d/mLAiknqVyJWkPCjl1L7dnXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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