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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ef30aa0ee5c8bef5ab3522829afb12c9db7dfff815af04d06d5a8160e61a90a' 
  AND token = 'EnEkTqwEM3J9+c9cuwygm+oh7ruj/ANVnnZ8EdZcz6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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