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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2b6f39313e893f8219678de488dc5ba472363678c2de8f85967a12127c35b852' 
  AND token = 'FfGECspfOwT0xfx4T/0ZkJsaXCu8uUU79JZe6U6qjLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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