SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b8d07099dcc6b0a3d9d4dfa7977861dfe5ad2ce01625985f564b9f87ddc0d1d8' 
  AND token = '1ZgAImhLMESAQGw1F6J7BFYNfywJ532LQhiCtyzlKp8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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