SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce377217443e599ee9629952f4285a1ae1c38ac7d192773e14030d8a7f177407' 
  AND token = 'WuyjVuCoOzzNgxp5DIqIw/GjB5RoewqArvGmrUQkgtk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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