Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9fdc483ef49e505f4a5c2112e3458eb60e74085e677d1bc5fdf9ded34acf88b0' 
  AND token = 'PoSGz5dG0KWGG1lZ1/ryQbhbffop4LCet2p8o/Ta00c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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