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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '406b337e6bf7d755cebd5d8d7f1ec87bb5c80d509cd6b70a57f0a3b361eee6ee' 
  AND token = '8Db4AjfGxm9RUuY45O1MOe7SriXrvmLfWrU/8SYEJMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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