SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '77c1b7f57ae5e3964ffadf74edbbc7fd067afaba1186cc02b7199736bc9f3e81' 
  AND token = 'smPYad0/RL9PYgaDD5o/w8MGyuYvzzIgJMUqv0eDZjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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