SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b048780a324ffcc5cda526dc742f9758a3dc890479be445ce36d84b598fc5c90' 
  AND token = 'mIVn9qpLi/mogjophIelq5J//cQr/O7Hv7hupHh4ZNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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