SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89bcb7f501025fdf6a634735754637995b260562bfe0fdd720b28e3af4145106' 
  AND token = 'ePLkwjzuxkyx0PDN8LVQ9nii6VxxZvIoZeg3Jv/VsYU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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