SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0df9d69d0a3e60269decaebf446cc7707ca10399340eeda5aaab78ddb2f59cb1' 
  AND token = 'WmkxaemAViNGoXWGE7+3LsJUvQ2XupT3ZKf6AYzBXsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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