SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4148d5b03578dbf4fb9315b1b5fe9c47e94696e8750b4645dccff8f2c74e7e0d' 
  AND token = 'tuaD2VQ3IwgilAH1BLiscQmxZXDuzgmVZIhvOwzESjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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