SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dd6d92dff66c3d9b1dbcd808363d1c5a76602eba4d925d8e4cea15df50c8745c' 
  AND token = '0j2YI8ZAWCqMytPW2KpFo++bI/JDIFvGLt/KdjKgY0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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