SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4970ccad093254a9025d778095d8996253fc466695bf13b0ba9a62bd76b1587d' 
  AND token = 'WS6z0VryYf8LWrZxwVnHpPTYNgpo5rvyzVK9JZ5ZJoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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