SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'abef3e8df5209fb033df66dd30c4923f94ef3d9d1010ff460b026e344f064d7b' 
  AND token = 'fMVZNo+YFCLhC+sQMPGwcnUJQ8qcjH+2a+G9DpHXsUk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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