Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92475321a045c41c62721c4bf2c52e4e616abc81e9cac753da5b0dd2573171c9' 
  AND token = '+tO/ucv5K5pYwTiWfR/ED3v3noDxJnRCBUQv+ISuwuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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