SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '16814a715d3a7ae7ff71b72780a42292b553d5df59b76f4327c96a3b2f755959' 
  AND token = 'Lh7aeqjtrRtmo1FYxHQ3Nw8U4qKQXuYBuVxdo8Odte8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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