Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7801d317019fddd0543ed7f782b566adb3bdc3466220169ab78dba0adcd6bc86' 
  AND token = 'Z+QmU8O5IQlkkrmtIBZfRZ4/Xtd75zt3ZrBjlnArLkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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