SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4d9ee580fc471b00c0753fa5f2702f7cb068a4635e6165fed9c79a82553e2fcc' 
  AND token = 'AQjXfeyLOJehcBAu1asR/+FD3iGveLhaejITbhYHI/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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