SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b9599df87830a06a5d24b4c665d4f71fb3622284fb4d551c7a02822064c787b' 
  AND token = 'bvFNg7WVidO13zUximpslGXLKEB5KqDa00cTZJ69Gjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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