SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dabcb3ca8fc3b9a2cb2ab13df7ca9f6075a6a10d3f75a041a76ab91df5247425' 
  AND token = 'Ik1uWPGXGFUG+nt6hYB59MhWBHqHLFVPYDBg8SxH2UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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