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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '209db26d71b276bdcba9a6b25cf1b105b56a939a7c0f8fe6fc39daee3a0ff878' 
  AND token = 'ZgxzKRjV/+Z4BkWbAyKS3tW6ZP3OjcePyjkN07TLLts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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