SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7590560cadb2bd22ab9d8f5e621714a6b39cfe0dcef7e8156419dfe8c24a630' 
  AND token = 'pJzVA+M0bnrpLsmGW5k7UOvc+gAkJLsRkEKpY+K5spI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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