Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6c959765f5b5bc201bbd954b7d3344cb7941a42598f904e70d7694ace5929a0e' 
  AND token = 'PHZiMM3cszRtfZL6be2KEHKE8zI/osgsuT6I/+aEY0o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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