SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd55823d8e781cb782080169f4eb6dc1df20125e91934eace19a5ef43b9fb6279' 
  AND token = 'zePdVs477/xZ9t+vIgI6pqbP5G0euBGOBEOR1ImVMMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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