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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '82adbe9bbcb1862b791fc327a463a66658091cd131e477888777baac28d82f19' 
  AND token = 'Yc/mbNX5iSc/miyDCj8P2RAX29j28MdNCcH94Mys7eU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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