SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '58ae5502d9d0eae37ed64dd2c6b5e1ce2e8b03eb947adbb82f3cf1f548578afe' 
  AND token = 'pwj4g77ujZYnCJUC8wi+Ww3QhTLMRxT5xkYFyfPHiZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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