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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b8afe34e9e989e058d1b84aee613aa07c004676720e3b7e1852b5975047a642' 
  AND token = '4fpApJspSR17T2Pft8WLLxs/5RHuGfVGDlEkP9L2suQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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