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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'dc848b9a87e83de8ba14d66edb6def8973a97e76158e91f53ac1c6aa748fcdc5' 
  AND token = 'JAavC8WBIBbqWAimZozmMQ1HDQsEWp9jO5As4qZZEOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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