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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '708e1c2f7575a8bcb14a6b9b7e5fe9b6fab21a55e579e61efa0ce9e4d80212ff' 
  AND token = 'RUbPg3sDXmz29FFAKS4xE2XyUWla9c6ujNuujCouK8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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