SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fb9ab9702e882cdfaba9e704253e6b147c2ad07eee7718f49ade34092ff1dce' 
  AND token = 'z1/ovc3+Xwv8WIJZWPTiYFVP6/dqg+ZkSnz3RzCLTMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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