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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf9bf3c07a7bb67186b60ab9105bd696ebfa9efdb718b6833ec40bdb2e82923b' 
  AND token = 'TfAtwpEH1lu3Va+O9KsWA08kmpifZ8+GNZPKPyhbC6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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