SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '172f452f8426be0e5296841fa425b4dd9c51e6624ff931412a4272796236a033' 
  AND token = '+w3Jq3zojB4H/ciEXRku1osXEhUyrefEGTpdHqKp630=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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