SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '742293c4579ed237012c91919c7ab890c24129b8688aedebadf404e1bfd9c0e7' 
  AND token = 'QVhGo6m3x00hhofIL/vKxUu1u32xJZPJcj16Y/IJoC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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