SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92289f264b59d90a350f6840d2aeffe44ee4957e19baf9b88fe19e706c171d21' 
  AND token = 'ZKXci2qpBtL/hfxKlkGOjSUVgFskXaWhM0bbJsgVCHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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