SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7ead1bcc557ac0f9e9eb0641841290ea2bbda454f1a61f6193ee35a1f308f269' 
  AND token = '8sDn+mdtvPy+E/shDGUOmk+XaoX5+vFGLq7lAnClwGI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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