SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc11b8bb30844efb9979e67e6631c087d568d3b745aa3a4280658dca5f2a3cae' 
  AND token = 'FsiaTpatV/h8leilph3ZkMVqXgHwtvmw4LuooGLMtXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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