SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2e3b8948ca04cc91e3473a90deaa651ed7f04147359a96cf224d0f98630856d5' 
  AND token = 'v0EMSvIwFl8l+5zLmhczL25ICu/0lw7HVf8OdAJpd+o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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