SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '18a3d26dc8e49975c1e81057e180ff82a7cf1494eca15b5e1f3aea28bcfd7c6d' 
  AND token = 'BGOdHuhh/4yrAzbGL4Onp6StiQCXEnhCJOCQVs+37/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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