SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce7e9c3b7f534e9f8cbef1724fb4b0dcbf4e1986121f115bba03dedd0c674c4d' 
  AND token = '/G0FPxmc0LqsAlXBxLDvIJihnlzzKp9VEEWxzBNCJ98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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