SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '00852a5d6d03e94c8bfb4a976cd4d11dc54e96fba932cc75657a68fb35ce163c' 
  AND token = '6qZhImEttnz2gdEuYwUYmzXA5J/QW4VcLO9Ur0kXsns=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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