SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4b73031382500792a3ff23ebc3289f05f6d04004ef66fe7d99faac45b7b5c9db' 
  AND token = 'LYTx8CpjJOI+7wG3J9Ymmp8KFptQYHwJKA34a8fWVu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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