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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9471dce8b8a3960905209021a878e825ff99190ff4ed822ba5eaf4d86764d59c' 
  AND token = 'Ai1cUd/9YQjRcoqSZU/6EzlAFuAw7NXRpt2foRKX/0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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