SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '65f1cc84f717854ba8c05b06492ac6264f5e1aa49d38ce588d2b87b2b3621491' 
  AND token = 'AJYQHrXjVGR0UNG8WoB9i/7WRWExaH7t+3DzTrKeQwE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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