SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e048ed26f6604f6a0e2453798c60205481e4c78616e3bd9086070cdba568309' 
  AND token = 'L3+lozi/PKdi1x0uGNmjgT3YDJzEJAwNxx9JxFQTy2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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