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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '396580c5b15105e72cf0fc8a52dca18355e885683d765c21a4b4295c41eab1e1' 
  AND token = 'jTcG+4WubURmB8UxBdrDHnUnVWlk4FbN3LTfunhDeoc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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