SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6961d2a53721728fda614c49ee3f1b1ebb78edf8bd68aa4d968f645e6ade3875' 
  AND token = '93O65X6VPYKhozeMZAD4qWqHY9j2T+aj8KpmXKH9M3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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