SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd2630a7d3bb078f8087183d917f8fb640dfc4b7a81124767c26a1e44549a7ab9' 
  AND token = 'iGHBl6X37Tkvvli3iCHh/Y2qi/P6nzgI5/wguXunNOM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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