SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92a538442fd2f9f8a366c6ab26123526ae32577c91be0e6b25db9f6f38ec7b48' 
  AND token = 'OrGVqgL7JYNTN9qKTApJKVYADpIYVrwvukbIvSN/7Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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