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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dbb6cba620224ee83b809bc41db4bec6291723a6c6ae8b089c97f47404334064' 
  AND token = 'GF7jB1w7K9AzBGlxZfJSj9Xdk8aEk4TxwKsZ7nv6+9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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