SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fa2277c77ea9fb6cc673821ffebb15f8c0876f78454689d57fc0fcb3f1e34b3b' 
  AND token = 'EAfyUZgJKl/+JYZdf4JjnSnJs/PYQo+Dgi24cs7t17w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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