SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92024835a3747ff57b6a4ab823e82b51ba2463917577f9d7764f41ad49c20e88' 
  AND token = 'fTShZMgzBYU2aXnxZlCslNy3McOKve/2pjWM2DPfOQ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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