SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '086d074cfa4f92c1ae852f8cc5e5302095b03b2b3456426ada790f39ba2f8870' 
  AND token = '9xejZJLl7SdZwTdmNh7duJ+rVC/Gi8TpcJLUcJfujuM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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