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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a6329b92e9e6be65136ea5a44cae95fc1fec302842c89601e440e6346a482b30' 
  AND token = 'yYNAeMDEIhXqoDUi8xJjRDPZ/IfHXWow0DobjEiv1Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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