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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '321ce132a5a548484d1e3927ad0cdcae5529777d5695655714b02a3266e3ce49' 
  AND token = 'bSymbOXsoP+u3ijV8z2o1rjyDdkBmQMf3caMkH1Waq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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