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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8fd1f3099002bca49483ed7f0312926039fa6daa79aa77faa25693311ef28be8' 
  AND token = 'DduIi7sn4V4oAh8WXz3pmv3EuGFQiV+n7j+SH9nEQmQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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