Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b41a0de1424335fe27a61f3dd12ea56b615ea2fe45108ded2ff68f2565ae28be' 
  AND token = 'yPIfVZGjzxDUH1E16fZBOnwA7gz0bqq2nmVgmvIdNxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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