SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '38c3bff3537e6e8e63050251b434a8e9ef8d4cdc9f05a12661360d4e14c4b46c' 
  AND token = '/XGxks4YLNunTQBmjPunlTsIb6zI6KaAnFKjOo+fJCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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