SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fd32cc0695f2334e5866858c568e88481455fde4fb15e3d000576361f69193d4' 
  AND token = 'c/7W0Zl7g0mqhbFVIZGXVI8HjDLBZvMt8j5wz3WWP7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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